VALUE OF RESEARCH 171 



some epidemic or some disease, the causes 

 of which are only surmised. The parasites, 

 germs, bacilli, suspected, have to undergo 

 rigorous examination, so that their whole de- 

 velopment may be made known, and the cause 

 of the disease or other trouble ascertained. 



Pasteur with his microscope was able to 

 save the vintage and the silk industries of 

 the Continent. Owing to the microscopic study 

 of parasites, bacilli, &c., our medical men 

 are gradually becoming more skilled in their 

 methods of conquering some diseases, in pre- 

 venting others, and in rendering some of them 

 less dangerous to human life. 



Malarial fever, now known as being chiefly 

 caused by the mosquito Anopheles as noticed 

 in another chapter, is a case in point. 



Miss Ormerod, armed with her microscope, 

 helped the farmers by showing to them the 

 life-history and habits of the insect-enemies of 

 their crops. 



Certain insects may be objectionable in ap- 

 pearance and habits, but their history, mode 

 of development, &c., must be known before we 



